The sequence of eruption of the mandibular permanent teeth is normally
1. central incisor.
2. lateral incisor.
3. canine.
4. first premolar.
5. second premolar.
6. first molar.
7. second molar.

(6)(1)(2)(3)(5)(4)(7)

(6)(1)(2)(3)(4)(5)(7)

(6)(1)(2)(4)(5)(3)(7)

(1)(6)(2)(3)(4)(5)(7)